Make it possible to disable account creation

This covers the usecase when LndHub is used to serve closed communities
which do not want to accept new members anymore (friends, families, etc).

The PR introduces a new envconfig option CREATE_ACCOUNTS which is true
by default but can be set to false if needed.

README.md

@@ -47,6 +47,7 @@ vim .env # edit your config
 + `PROMETHEUS_PORT`: (default: 9092) Prometheus port (path: `/metrics`)
 + `WEBHOOK_URL`: Optional. Callback URL for incoming and outgoing payment events, see below.
 + `FEE_RESERVE`: (default: false) Keep fee reserve for each user
++ `ALLOW_ACCOUNT_CREATION`: (default: true) Enable creation of new accounts
 
 ## Developing
 

lib/service/config.go

@@ -20,4 +20,5 @@ type Config struct {
 	PrometheusPort        int    `envconfig:"PROMETHEUS_PORT" default:"9092"`
 	WebhookUrl            string `envconfig:"WEBHOOK_URL"`
 	FeeReserve            bool   `envconfig:"FEE_RESERVE" default:"false"`
+	AllowAccountCreation  bool   `envconfig:"ALLOW_ACCOUNT_CREATION" default:"true"`
 }

main.go

@@ -148,7 +148,9 @@ func main() {
 	strictRateLimitMiddleware := createRateLimitMiddleware(c.StrictRateLimit, c.BurstRateLimit)
 	// Public endpoints for account creation and authentication
 	e.POST("/auth", controllers.NewAuthController(svc).Auth)
-	e.POST("/create", controllers.NewCreateUserController(svc).CreateUser, strictRateLimitMiddleware)
+	if c.AllowAccountCreation {
+		e.POST("/create", controllers.NewCreateUserController(svc).CreateUser, strictRateLimitMiddleware)
+	}
 	e.POST("/invoice/:user_login", controllers.NewInvoiceController(svc).Invoice, middleware.RateLimiter(middleware.NewRateLimiterMemoryStore(rate.Limit(c.DefaultRateLimit))))
 
 	// Secured endpoints which require a Authorization token (JWT)